package com.dzygod.micro.product.service.impl;

import org.springframework.stereotype.Service;

import java.util.Comparator;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.dzygod.micro.common.utils.PageUtils;
import com.dzygod.micro.common.utils.Query;

import com.dzygod.micro.product.dao.CategoryDao;
import com.dzygod.micro.product.entity.CategoryEntity;
import com.dzygod.micro.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> listWithTree() {
        // 1.查出所有分类
        final List<CategoryEntity> entities = baseMapper.selectList(null);

        return entities.stream()
                .filter(category -> category.getParentCid() == 0)
                .peek(menu -> menu.setChildren(getChildes(menu, entities)))
                .sorted(Comparator.comparingInt(CategoryEntity::getSort))
                .collect(Collectors.toList());
    }

    private List<CategoryEntity> getChildes(CategoryEntity root, List<CategoryEntity> all) {
        return all.stream()
                .filter(CategoryEntity -> CategoryEntity.getParentCid().equals(root.getCatId()))
                .peek(CategoryEntity -> CategoryEntity.setChildren(getChildes(CategoryEntity, all)))
                .sorted(Comparator.comparingInt(CategoryEntity::getSort))
                .collect(Collectors.toList());
    }

}
